000
FXUS65 KSLC 021726
AFDSLC
Area Forecast Discussion
National Weather Service Salt Lake City UT
1026 AM MST Fri Dec 2 2016
.SYNOPSIS...A cold upper trough will exit the area tonight. High
pressure will move over the region tonight into Sunday. A colder
upper trough will slowly cross the area through the first half of
the upcoming week.
&&
.DISCUSSION...The weak storm system rotating across northern Utah
continues to weaken as it merges with a California trough. Best
moisture and instability has moved into central and southern Utah
but so far seeing a fair amount of cloud cover with very little
precipitation. Earlier band off the GSL has mostly dissipated,
with only a few very weak showers remaining. Any additional snow
should be light at best.
Northeasterly pressure gradient has developed over the state due
to the orientation of the trough. This gradient is strongest over
southwest Utah, and with good cold advection and 700 mb flow, this
is producing some gusty gap winds in Washington county. Strongest
gusts so far have been around 50 mph, though most gap areas are
seeing gusts in the 30s. The pressure gradient is expected to
remain fairly tight over Dixie through Saturday morning, so gusty
winds should continue. Going Wind Advisory covers the threat well.
High pressure centered off the California coast will start to
build into the forecast area tonight and persist into Sunday
before being flattened by the approach of the next storm system.
Models continue to indicate Arctic air coming in with the system
early next week, bringing the coldest temperatures of the year so
far. Global models continue to disagree somewhat on the amount of
moisture associated with the system, but there should at least be
a decent band of snow with the front.
Updates the forecast earlier to adjust POPs and sky grids with
current trends. No additional updates planned.
&&
.AVIATION...Ceilings through the day at KSLC terminal should
remain above 7000 ft, with increasing clouds more after 00z this
evening. Northerly winds to the west of the terminal may become
gusty this afternoon, so the terminal may see brief periods of
increased winds. A southeasterly switch is anticipated after 03z.
&&
.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Wind Advisory until 10 AM MST Saturday for UTZ019.
WY...None.
&&
$$
PUBLIC...Traphagan
AVIATION...Dewey
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